JPH07220314A - Magneto-optical disk device - Google Patents

Abstract

(57) [Summary] [Object] In a pickup device for a magneto-optical disk, a magnetic field applying head part is separated from a carriage to form a separate unit, and its base part covers an opening part of the carriage, and Depending on the specifications of the device, the assembly work can be done by forming it integrally with the dust-proof and protective cover of the objective lens drive device, the cover glass support member (in the case of a separation optical system) of the opening through which the light beam enters, etc. Reliability and reliability, and cost reduction. In a magneto-optical disk device, a member for mounting at least one of the magnetic head and the DC magnetic field generating device, which is a bias magnetic field applying means, on a base portion of the optical pickup device, and dust protection of an opening portion of the optical pickup device. At least one of the closing member for protection and the protective member for the objective lens driving device is integrally formed with each other.

Description

Detailed Description of the Invention

[0001]

The present invention relates to magneto-optical recording,
The present invention relates to a magneto-optical disk device equipped with an optical pickup device.

[0002]

2. Description of the Related Art FIG. 8 shows an optical pickup device used in a magneto-optical disk device for performing magneto-optical recording by a conventional magnetic field modulation method. In this conventional example, a flying magnetic head 101 for magnetic field modulation recording is used as a carriage 1.
The rotating shaft 1 is attached to a part of the disc 04 extending to the outer peripheral side of the disc.
A pickup of the separation optical system is attached via 15. The objective lens driving device mounted on the carriage 104 has an opening above the objective lens.
It is covered with a cover 106 that is both dustproof and protects the device. Further, here, since the optical system is a separation optical system, the carriage 104 is provided with an opening through which the laser light flux enters and exits from the outer peripheral side of the disc, and the opening is provided with a dust A cover glass for preventing intrusion is attached via the case 110. Further, an optical pickup device for a magneto-optical disk device of an optical modulation recording system without a magnetic head, a phase change type, a ROM
In the separation optical system of the optical pickup device for the reflected light intensity system such as the above, the dustproof and protective cover of the objective lens driving device and the supporting member of the side cover of the carriage on the side of the carriage where the laser beam enters and exits are separately provided. It is configured.

[0003]

However, the magneto-optical disk device and the optical disk device described above have the following drawbacks. That is, in the above-described magneto-optical disk device, since the supporting portion of the retracting mechanism of the magnetic head 101 is formed directly on the carriage 104, the position adjusting mechanism of the magnetic head core position and the optical axis is changed to the magnetic head retracting means. It must be placed on the moving part of. Moreover,
To adjust the position of the magnetic head, with the disk loaded,
Since recording and reproduction are performed while confirming by magnetic field modulation, the assembling and adjustment of optical components, sensors, and the like on the optical pickup device side must be completed by that time. Therefore, in the configuration in which the magnetic head unit is always mounted on the carriage 104, the workability of assembly is poor, and there are problems in terms of reliability and cost.

Further, in the light intensity modulation type disk device, the carriage closing / protecting member for mounting the objective lens driving device and the cover glass holding member for opening / closing the laser beam are individually provided. Since it is installed in the carriage, a fixing part for fixing these to the carriage is required individually, so the workability of assembly is poor, and
There are problems in terms of reliability and cost.

[0005]

SUMMARY OF THE INVENTION The present invention has been made based on the above circumstances. In a magneto-optical disk pickup device, the magnetic field applying head portion is separated from the carriage to form a separate unit, and its base portion is Integrated with the dust-proof and protective cover of the objective lens driving device and the support member (in the case of a separation optical system) of the cover glass of the opening where the light beam enters, so as to cover the opening of the carriage and according to the specifications of the device. The purpose of this is to improve workability and reliability of assembly and to reduce cost by forming the same.

Further, in the optical intensity modulation type disk pickup device, a member for covering the objective lens driving device to protect it from dust and protection, and a member for closing other openings on the carriage are integrated. The purpose of this method is to improve workability and reliability of assembly and to reduce cost by mechanically molding.

[0007]

In order to achieve the above object, the present invention provides a magnetic field modulation type pickup device for a magneto-optical disk, in which a magneto-optical medium film and a protective film are formed on a transparent plate. The optical pickup device and the magnetic head for magnetic field modulation are opposed to each other on both sides, and the magnetic head is loaded / loaded onto the disk and the disk cassette.
Hold it on the holding member together with the mechanism for unloading,
The holding member is integrally formed with a member that covers the gap between the objective lens driving device and the carriage except the lens opening.

In the case of the separation optical system, the holder of the cover glass may be integrally formed so as to close the opening through which the laser light flux enters and exits. Further, in a light modulation type pickup device for a magneto-optical disk, a pickup device for modulating a light intensity such as a WORM, a ROM, a member for covering a gap between the objective lens driving device and a carriage except a lens opening, and a laser. A holder of a cover glass for closing the opening through which the light flux enters and exits is integrally molded. further,
As an additional function to these, a light blocking member of a light blocking sensor for detecting the position of the carriage and the like may be molded at the same time.

[0009]

1 and 2 show the outline of an optical pickup device for magneto-optical recording, which fulfills both functions of magnetic field modulation recording and optical modulation recording, relating to the magneto-optical disk device of the present invention. The present embodiment is an example of a separation optical system, and the fixed optical unit 10 includes a semiconductor laser that is a light source, a collimator, a sensor that receives a data signal, and an optical element that detects a focus error and a tracking error. The carriage 4 supported by the guide rail 9 and the guide roller 6 so as to be movable in the disk radial direction has an objective lens 2a 'for focusing the laser light on the disk surface and a focus lens 2a'. A device for driving in the tracking direction, a magnetic head 3 for magnetic field modulation recording, and a bias magnet 8 for optical modulation recording are mounted.

Incidentally, here, a member 1a for closing a gap between the shielding member on the disk facing surface of the objective lens driving device 2 and the carriage 4, the magnetic head 3 for magnetic field modulation recording, and the electromagnet 8 for generating a light modulation recording bias magnetic field. An attachment member 1b for the carriage 4 and a holder 1C for a cover glass 2c 'that closes an opening through which the laser beam emitted from the fixed optical unit 10 enters the carriage 4 are formed integrally with each other.

FIG. 3 shows an embodiment in which the closing member 1a and the fixed portion 1b of the magnetic field modulating magnetic head 3 are integrally formed in a back shape. This is an embodiment on the premise that a portion that is not directly related to the selection of the optical system integrally or separately configured is unitized, and for example, an MD having a recording function.
It can be applied to an optical pickup device for (mini disc).

FIG. 4 shows a holder 1C for a gap closing member 1a and a cover glass 2c 'for closing an opening through which a laser beam emitted from the fixed optical section 10 enters the carriage 4.
An example in which and are molded into an integral structure is shown. This is an example of a premise to be adopted in an optical pickup device that employs a separation optical system regardless of the recording / reproducing system.

In the above embodiments, the injection molding method using a synthetic resin material is the easiest to apply as a method of integrally molding, but the partially manufactured ones are finally joined. But it is possible. Further, the following functions may be added by taking advantage of the integrally molded structure. 5 and 6 show an example in which a part of the position detecting means of the carriage 4 is manufactured on the above-mentioned integrated structure.

This structure is means for confirming the position of the carriage 4 when the power is turned on and for recognizing the moving direction. By shielding the optical shading sensor 21 from the shading plate 20, a detection signal is output. Is the format used. here,
The shield member on the disk facing surface of the objective lens driving device and the member 1a for closing the gap between the carriage 4 and the light shielding plate 20 are integrally molded. In FIGS. 5 and 6, the magnetic head mounting member 1b and the cover glass supporting member 1c are
Although not integrated, it is easy to integrate according to the specifications.

Further, as additional functional parts, the fixed part of the wiring member, the contact part at the time of mechanical crash stop, and the engaging member for the movable part brake may be integrally molded at the time of molding. FIG. 7 shows a comb tooth 50 that is driven in the direction of the arrow in the drawing according to the presence or absence of a disk and an arbitrary electric signal.
Is integrally formed with the comb tooth portion 40 that engages with the member 1a that closes the gap between the shielding member on the disk facing surface of the objective lens driving device and the carriage 4.

[0016]

As described above, in the magneto-optical disk device of the present invention, the optical pickup device has a member for attaching a recording function component such as a magnetic head and a bias magnet to a movable portion (carriage), and a dustproof means. ,Moreover,
By integrally molding the movement restricting means such as the head brake, the workability of assembly and the accuracy of the mounting position can be improved, and the members fastening the respective parts can be omitted. For the above reasons, cost reduction and high reliability of the device can be secured.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an optical pickup device of a separation optical system of a combined magnetic field modulation / light modulation type according to the present invention.

FIG. 2 is a side view of a movable part of FIG.

FIG. 3 is a schematic perspective view of a case in which a cover for an objective lens driving device and a magnetic head base are integrally molded.

FIG. 4 is a schematic perspective view of an example in which a cover for an objective lens driving device and a holder for a cover glass at an opening on a side surface of a carriage are integrally molded.

FIG. 5 is a schematic perspective view of an example in which a cover for an objective lens driving device and a light blocking plate for a light blocking sensor for detecting a carriage position are integrally molded.

6A and 6B are a front view and a side view of a case example in which a cover for an objective lens driving device and a light blocking plate for a light blocking sensor for detecting a carriage position are integrally molded.

FIG. 7 is a schematic perspective view of an example in which the objective lens driving device cover and the control comb teeth at the carriage position are integrally molded.

FIG. 8 is a schematic perspective view of a conventional optical pickup device equipped with a magnetic head for magnetic field modulation.

[Explanation of symbols]

 1a Objective lens driving device protection, dustproof cover member 1b Carriage open part closing member 1c Dustproof cover glass support member 2 Objective lens driving device 2a Objective lens 2b Laser beam repelling mirror 2c Dustproof cover glass 3 Magnetic field modulation recording magnetic head 4 Carriage 5 Linear motor drive coil 6 Guide roller 7 Guide shaft 8 Bias magnet 9 Linear motor yoke 10 Fixed optical part 11 Rotation support shaft 12 Magnetic head rotation mechanism part 20 Light-shielding member 21 Light-shielding sensor 40 Comb teeth

Claims (4)

[Claims] 1. An optical pickup device comprising a transparent plate, a magneto-optical medium film and a protective film above the transparent plate, and irradiating the magneto-optical medium film with laser light to write and read a magneto-optical signal. At least one of the magnetic head for magnetic field modulation magnetic bias and the DC magnetic field generator for optical modulation is arranged on the plate side, and is positioned on the protective film side of the disk so as to face the optical pickup device. In a magneto-optical disk device for moving at least one of a head and a DC magnetic field generating device in a track in the radial direction of the disk integrally with the optical pickup device, the magnetic head and the DC which are bias magnetic field applying means. A member for attaching at least one of the magnetic field generators to the base of the optical pickup device, and the optical pickup And at least one of the protective member of the closure member and the objective lens driving device for dust-proof of the open portion of the location, a magneto-optical disk device characterized by being integrally formed with each other. 2. A dust-proof objective lens drive device, a protective cover member, and a base member for mounting the bias magnetic field applying device to a movable portion of an optical pickup device, or a dust-proof glass supporting case member for a laser light incident portion. The magneto-optical disk device according to claim 1, wherein the two members are selected and integrally molded with a synthetic resin material. 3. A part of a dustproof and protective cover of an objective lens driving device, a dustproof glass supporting case of a laser light incident part, and a base member for attaching the bias magnetic field applying device to a movable part of an optical pickup device. 2. The magneto-optical disk device according to claim 1, wherein the magneto-optical disk device is formed by projecting to form a light-shielding member of an optical sensor for detecting a position of a movable portion of the optical pickup device in a disk radial direction. 4. A part of any one of a dustproof and protective cover of an objective lens driving device, a dustproof glass supporting case of a laser light incident part, and a base member for attaching the bias magnetic field applying device to a movable part of an optical pickup device. 2. The magneto-optical disk device according to claim 1, wherein the protrusion is formed to form a protrusion that engages with the movement restricting means in the disk radial direction of the movable portion of the optical pickup device when the disk is not mounted. .